A SELF LOCKING FASTENER FOR HANGING THINGS ON WALLS OF CONCRETE OR OTHER MATERIALS

Abstract: Fastening device for a bore hole which device is used when articles (6, 15) are hanged on a concrete- or a board-wall. The fastening device changes the pulling force (8, 14) of the article (6, 15) hanged thereon into a frictional force, and locks the device to the bore hole with the help of an insert lever and a fulcrum causing the frictional force.

Description: A self locking fastener for hanging things on walls of concrete or other materials. The object of invention is a self-locking fastener for hanging articles on walls of concrete, board or other materials. When hanging articles on a concrete wall, one way of mounting the fastener is setting into the drill hole a spreader peg, which is extended by a screw turned inside the peg, thus creating a state of locking in the drill hole with the help of friction. The opposite end of the peg is often a hook for hanging articles on, which strives to resist the traction force caused by the article to be hung so much, that the article remains hanging on on the wall by producing friction between the drill hole and the spreader peg. Often a usual screw is used, too, which is because of the need of force driven with a screw¬ driver into the spreader peg, and the article is hung on the head of the screw, which has been left projecting from the wall surface. When hanging articles on walls of board materials, one way of mounting the fastener is setting into the drill hole a spreader peg, which is expanded by a screw turned inside the peg partly inside the drill hole, partly on the wall surfaces, which causes a state of locking in the drill hole with the help of friction. The opposite end of the screw is often a hook for hanging articles on. In this way of mounting, too, the purpose is to resist the traction force caused by the article to be hung so much that the article remains hanging on the wall. As defects of fasteners to be mounted in holes drilled on walls of concrete or other materials can be regarded the need of many tools and a lot of time due to the use of force in the above mentioned way of mounting, the reason being numerous loose parts and several working phases. When moving the fastener, the peg often remains in the drill hole, causing a waste of materials. In the known solutions there is no exploitation of traction force of the articles to be hung on the wall, but the steadiness of the fasteners on the wall is secured by locking the fastener into the drill hole by means of friction. By means of a fastener as per invention you obtain decisive improvement to the above mentioned defects. To realize this, the typical features of a fastener as per invention are stated in the characteristics section of independent patent claims. The advantage of the invention is the unnecessity of tools due to minimal use of force. There are no loose parts, which saves time and wastes no materials. In accordance with the invention the traction force of the articles is exploited in such a manner that the fastener is locked into the drill hole. This means that the unused energy in the form of traction force is taken for utility purpose. If in the known solutions you often use too big fasteners to secure the hanging on the wall of the article, the safe load of the fastener as per invention is always correct, since the article fastens itself into the drill hole. Typical features of the different ways of adap¬ tation of the invention are stated below in the sub-claims. Below a detailed explanation of the fastener as per invention in two different ways of realization: on a concrete wall and on a board wall, with references to the enclosed drawing, on which Figure 1 depicts a fastener as per invention in a drill hole, seen fron one side, on a concrete wall, where the traction force of the article hung acts on the fastener, Figure 2 depicts a fastener as per invention, in use on a concrete wall, seen from above, Figure 3 depicts a fastener as per invention in a drill hole, seen from one side, on a board wall, where the traction force of the article hung acts on the fastener, Figure 4 depicts a fastener as per invention on a board wall, seen from above. Figure 1 depicts a fastener as per invention, seen from one side, in a drill hole on a concrete wall, where the fastener has been formed into a uniform piece from e.q. an iron bar by mechanical grinding into the depicted shape. Hanging from the fastener on hook 4 is article 6, causing traction force 8 downwards because of the gravity of the Earth acting on article 6. Eccentric rod 1 has been pushed so deep into the drill hole that stopper 5 is touching the wall surface, preventing the fastener from fully penetrating into the drill hole. As traction force 8 is transmitted to contact surfaces 2 and 3 because of the form of eccentric rod 1, friction is created between drill hole wall 7 and contact surfaces 2 and 3, and the fastener is locked into the drill hole. The contact surfaces have purposefully been bevelled sharp in the transversal direction of the fastener. This takes into use the energy of article 6 hung on the hook manifesting itself as traction force 8. If article 6 is removed from hook 4, traction force 8 and locking force are cancelled, and the fastener can either be moved with little force or it can be easily removed. Also, the range of contact surfaces 2 and 3 within the drill hole can vary to some extent because of the slack of eccentric rod 1 at the mouth of the drill hole. This makes possible the use of the fastener with more than one size of drill holes and increases possi¬ bilities of use. Figure 2 depicts a fastener as per invention used on a concrete wall, seen from above, and clarifies the shape of the fastener from this direction. Figure 3 depicts a fastener as per invention, seen from one side, in drill hole 17 on a board wall, where the fastener has been formed into a uniform piece by e.q. die-casting from plastic. Article 15 has been hung on hook 13 on the fastener, which creates traction force 14 downwards. Eccentric rod 9 has been pushed so deep into drill hole 17 that stopper 10 is touching the outer surface of wall 16. As traction force is transmitted to contact surfaces 11 and 12 because of the shape of eccentric rod 9, friction is created between the drill hole and contact surfaces 11 and 12 and between the outer surface of wall 16 and stopper 10, and the fastener is locked into the drill hole. This takes the energy of article 15 hung on the hook into use, which is manifesting itself as traction force 14. If article 15 is removed from hook 13, traction force 14 and locking force are cancelled, and the fastener can be moved in drill hole 17 with little force, or it can be easily removed from the hole. The penetration of the fastener into drill hole 17 is made possible by the shape of eccentric rod 9, which is thinning and slightly curved, and which also guides surfaces 10, 11 and 12 to act on the board as shown in the diagram. The stress caused by friction on the board wall at contact points 10 and 11 is decreased and the strength of the board material, e.q. gypsum board, is improved, because the stresses directed to the board from different directions tend to cancel one another. By enlargening stopper 10 the stress caused by friction can be divided onto a larger area on the outer surface of wall 16. This makes possible the increase of traction force 8 without breaking the board. Figure 4 depicts a fastener as per invention in use on a board wall, seen from above, clarifying the shape of the fastener from this direction. A special feature of the invention is, that a fastener as per invention is not limited to presented shapes, but instead of a hook different shapes of the hanging part can be used, which makes possible hanging from the ceiling, too. Threading the inside of the eccentric rod of the fastener makes possible the combining of different shapes of the hanging part with a suitable threaded tap for the threads of the eccentric rod. The shapes of the contact surfaces can be diffe¬ rent, for example bevelled sharp, conically thinning, roundish and partly following the drill hole, broad and level surfaces or spherical surfaces. The quality of the surface can be rough, smooth or covered with glue. The invention is by no means limited to the above examples, but many variations are possible, as defined in the inventional thought of the patent claims below.

Claims: Patent claims 1. A self-locking fastener for hanging articles (6) on walls of concrete or other materials, k n o w n by consisting of a locking part (1), a hanging part (4), e.q. a hook, at the end of the locking part, the locking part itself consisting of an oblong part pushed into a hole (7) made on the wall, with at least two contact surfaces (2,3) formed at its end or close to that, which act on in the vertical plane direction of the board in such a manner that when an article (6) is hung on the hanging part (4), the contact surfaces press against the wall of the hole (7) because of leverage, and lock the fastener in its place. 2. A self-locking fastener as per patent claim 1, k n o w n by its projecting contact surfaces (2,3) which define the outer measures of the locking part in such a manner that the fastener can loosely be moved in the hole (7) drilled for it. 3. A self-locking fastener as per patent claims 1 and 2, k n o w n by the contact surfaces (2,3) bevelled sharp in the transversal direction of the fastener. 4. A self-locking fastener as per patent claims 1 - 3, k n o w n by the locking and hanging parts (1,4) having been made of one piece. 5. A self-locking fastener as per patent claim 4, k n o w n by the fastener having been made by die- casting from plastic. 6. A self-locking fastener as per patent claim 4, k n o w n by the fastener having been made from metal, 7. A self-locking fastener for hanging articles (15) on walls of board materials, k n o n by the fastener consisting of a locking part (9) and a hanging part (13), e.q. a hook, connected to the locking part. The locking part consists of an oblong part with at least two contact surfaces (11,12) acting on in the vertical plane direction of the board when the oblong part has been pushed into the hole (17) made on the board (16). Now, as the article (15) is hung on the hanging part (13) the contact surfaces press against the walls of the hole (17) because of leverage, and lock the fastener into its place. 8. A self-locking fastener as per patent claim 7, k n o w n by the front contact surface (11) reaching over the edge of the board so that a third contact sur¬ face (10) is created, acting on the front surface of the board (16). 9. A self-locking fastener as per patent claim 7 or 8, k n o w n by the shape of the locking part (9), which is mainly slightly upwards curving and conically narrowing towards the end, whereby the contact surfaces (11,12) are in contact with the walls of the hole (17) close to its both edges. 10. A self-locking fastener as per any of patent claims 7-9, k n o w n by the contact surfaces (11,12) defining the outer measures of the locking part so that the fastener can be loosely moved in the hole (17) drilled for it. 11. A self-locking fastener as per any of patent claims 7-10, k n o w n by the locking and hanging parts of the fastener having been made of one piece. 12. A self-locking fastener as per patent claim 11, k n o w n by the fastener having been die-cast from plastic.

Inventors: VINNI JORMA, VINNI KOESSI, VINNI MILJA, VINNI, JORMA, VINNI, KOESSI, VINNI, MILJA
Applicants: FESTCLIP OY, VINNI JORMA, VINNI KOESSI, VINNI MILJA, VINNI, JORMA, VINNI, KOESSI, VINNI, MILJA
Application year: 1994
Main classification: F16B13
IPC codes: F16B13, F16B45